Process of manufacture of a master disk and/or of an optical disk

Abstract

The invention concerns a preformatted substrate, a preformatted substrate comprising information to be duplicated, as well as their processes of manufacture and a process of manufacture of a master disk and/or an optical disk. The preformatted substrates are constituted of a support coated with a layer of resin sensitive to at least one stress comprising on its surface a first succession of micropits or first groove representative of the preformatting signal, the depth of these micropits or groove being smaller than the thickness of the layer of photosensitive resin. These substrates may be used in the field of information archiving and in the field of manufacture of optical disks.

What is claimed is: 
     
       1. A process of manufacture of a master disk and/or of an optical disk, comprising the steps of: depositing onto a support a layer of a resin sensitive to at least one stress,   transferring into the layer of sensitive resin a preformatting signal, this transfer leading to the creation of a first succession of micropits or first groove representative of the preformatting signal, the depth of these micropits or groove being smaller than the thickness of the layer of sensitive resin by applying a first stress,   recording into the layer of sensitive resin the information to be duplicated by applying a second stress, this recording leading to the creation of a second succession of micropits representative of the information to be duplicated, the depth of the micropits of the second succession being equal to the thickness of the layer of sensitive resin within the zones where they are created,   transferring the information into the substrate, thereby leading to the creation of micropits into the substrate, and   removing the zones of residual resin,   the master disk or the optical disk thus obtained comprising the information to be duplicated only and not the preformatting signal.   
     
     
       2. The process according to claim 1, further comprising, after the step of removal of the residual resin, depositing, onto said micropitted support, a layer of a material which is hard, which reflects in the near infrared range and which is conductive. 
     
     
       3. The process according to claim 1 wherein said second succession of micropits is created under the first succession of micropits or first groove. 
     
     
       4. The process according to claim 1, wherein said second succession of micropits is created within zones of resin different from those located under the first succession of micropits or first groove. 
     
     
       5. The process according to claim 1 wherein the thickness of the layer of sensitive resin is between about 100 nm and about 1 μm, and wherein the depth of the micropits of the first succession of micropits is about 75 nm. 
     
     
       6. The process according to claim 1, wherein the support is made of glass. 
     
     
       7. The process according to claim 6, further comprising depositing a layer of material which is hard, which reflects in the near infrared range and which is conductive between the support and the layer of sensitive resin, wherein the information is transferred in this case into said layer of hard, reflective and conductive material. 
     
     
       8. The process according to claim 7 wherein the hard, reflective and conductive material is selected from the group consisting of a nitride or carbonitride of zirconium, hafnium and titanium. 
     
     
       9. The process according to claim 1, wherein the support is made of aluminum. 
     
     
       10. The process according to claim 1, wherein the substrate is made of a material which is hard, which reflects in the near infrared range and which is conductive. 
     
     
       11. The process according to claim 10 wherein the hard, reflective and conductive material is selected from the group consisting of a nitride or carbonitride of zirconium, hafnium and titanium.